78361506618481 has 4 divisors (see below), whose sum is σ = 78450251247472. Its totient is φ = 78272761989492.

The previous prime is 78361506618469. The next prime is 78361506618503. The reversal of 78361506618481 is 18481660516387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78361506618481 - 2²⁹ = 78360969747569 is a prime.

It is a super-2 number, since 2×78361506618481² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78361506618181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44372313171 + ... + 44372314936.

It is an arithmetic number, because the mean of its divisors is an integer number (19612562811868).

Almost surely, 2^{78361506618481} is an apocalyptic number.

It is an amenable number.

78361506618481 is a deficient number, since it is larger than the sum of its proper divisors (88744628991).

78361506618481 is an equidigital number, since it uses as much as digits as its factorization.

78361506618481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88744628990.

The product of its (nonzero) digits is 46448640, while the sum is 64.

The spelling of 78361506618481 in words is "seventy-eight trillion, three hundred sixty-one billion, five hundred six million, six hundred eighteen thousand, four hundred eighty-one".